I have been using these keys for over 30 years, since about Windows 2.1. I always stumble if an application does not support them. If there is a second person like me, then this suggestion will help two people. Thanks!
Compared to X C V, I always found those shortcuts super awkward to remember (and awkward to finger considering I normally have right hand on the mouse and left hand poised over CTRL and X C V). Are you a southpaw?
The logic behind the X C V shortcuts also suited the way my brain is wired & helped me turn them into muscle memory... ctrl+x (x looks like scissors for cutting) ctrl+c (c is for copy) ctrl+v (v for paste... umm, because its the next key along is guess )
But I wonder, do some keyboards have X C V keys in a different location?
I am right handed, and have normal hands, but somehow a left pinky on ctrl and then pressing x,c, or v with the same hand has never worked for me. So I have to use two hands anyway. I have used the ctrl-delete, ctrl-insert, and shift-insert keys from the beginning. To me it is super natural and don't even notice that I let go of the mouse.
Also, I am not a big spreadsheet user, but using the keys used in conjunction with ctrl/shift - home, end, and the arrow keys, lets one through a spreadsheet copying and pasting.
Wow! I've not come across that for decades now I built a mainframe terminal version of CUA screens not long after the standards came out - that must be mid-late '80's.
The ones that Steve has listed have been a common standard for a couple of decades now.